<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(cart,index) of cartInfoList" :key="cart.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" @change="handlerChangeChecked(cart,$event)" :checked="cart.isChecked">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{cart.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cart.skuPrice}}</span>
          </li>
          <li class="cart-list-con5"> 
            <a href="javascript:void(0)" class="mins" @click="handler('minus',1,cart)">-</a>
            <input autocomplete="off" type="text" :value="cart.skuNum" minnum="1" class="itxt" @change="handler('change',$event.target.value*1,cart)">
            <a href="javascript:void(0)" class="plus" @click="handler('add',-1,cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cart.skuNum*cart.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCart(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllChecked && cartInfoList.length>0" @change="changeAllChecked($event)">
        <span>全选</span>
      </div> 
      <div class="option">
        <a @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex';
// 节流操作
import { throttle } from "lodash";
  export default {
    name: 'ShopCart',
    mounted(){
      this.getData();
    },
    computed:{
      ...mapGetters(['cartList1']),
      cartInfoList(){
        return this.cartList1.cartInfoList||[]
      },
      // 计算每一种商品的总价
      totalPrice(){
        let sum=0;
         this.cartInfoList.forEach(item => {
          sum+=item.skuNum*item.skuPrice;
        });
        return sum;
      },
      // 当cartInfoList的每一项的isChecked都是1的时候，返回真-----every
      isAllChecked(){
        return this.cartInfoList.every(item=>item.isChecked==1);
      }
    },
    methods:{
      getData(){
        this.$store.dispatch('getCartList');
      },
      // 修改产品的个数
      handler:throttle (async function(type,disNum,cart){
        // type为了区分三个地方
        // disNum形参： +变化量（1） -变化量（-1） input最终1个数
        // cart :哪一个产品（身上有产品id和购买的数量等）
        switch(type){
          case"add": disNum=1; break;
          case"minus": disNum=cart.skuNum>1? -1 : 0; break;
          case"change":
          // isNaN ---非法的
          // if(isNaN(disNum)|| disNum<1){
          //   disNum=0;
          // }else{
          //   disNum=parseInt(disNum)-cart.skuNum;
          // }
          disNum= isNaN(disNum)|| disNum<1 ? 0:parseInt(disNum)-cart.skuNum;
          break;
        }
        try {
        await  this.$store.dispatch("addOrUpdateShopCart",{skuId:cart.skuId,skuNum:disNum});
        this.getData();
        } catch (error) {
        }
      },1000),
      async deleteCart(cart){
        try {
          await this.$store.dispatch("deleteShopCart",cart.skuId);
          this.getData();
        } catch (error) {
          alert(error.message)
        }
      },
      async handlerChangeChecked(cart,event){
        // 处理参数，获取当前的选中状态，传给接口
        let isChecked=event.target.checked? "1":"0";
        try {
          await this.$store.dispatch("changeChecked",{skuId:cart.skuId,isChecked});
          this.getData();
        } catch (error) {
          alert(error.message);
        }
      },
      async deleteAllCheckedCart(){
        try {
          await this.$store.dispatch("deleteAllCheckedCart");
          this.getData();
          
        } catch (error) {
          alert(error.message);
        }
      },
      async changeAllChecked(event){
        let isChecked=event.target.checked? "1":"0";
        try {
          await this.$store.dispatch("changeAllChecked",isChecked)
          this.getData();
        } catch (error) {
          alert(error.message);
        }
      }
    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }


          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 13%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>